a tule fog
covers the valley-
I read about Tule fog and likes the image so much that I composed the above haiku.
A Tule fog (pronounced too-lee) is a very thick fog that collects in parts of California during the rainy season of the late fall and winter. It is a type of radiation fog, caused by the combination of increased humidity due to the rain and rapid cooling due to the longer nights. Tule fog makes for very low visibility and is the cause of many accidents every year.